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Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

Navigation chart of the Sunda Strait, focusing on bays and islands, and showing bathymetry (sea depth), anchor points, shoals and reefs. Includes an inset map of the bay of the Isle de Mew (Peucang Island). The web of lines is a rhumbline network.

Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

Two maps. One features most of the world, but with Borneo, Philippines and most of mainland Southeast Asia missing, though there is an inset map of Penang. The other is a navigation map of the strait at Penang, with bathymetry and elevations.

This map of the Straits of Malacca features shoals and reefs, bathymetry (sea depth), drawings of side views of landmark mountains (elevations), all designed to aid navigation. The various straits used around Singapore are also marked.

A page from Abbé Prévost’s ‘Histoire Générale des Voyages’. The top map shows the Bay of Laphao on Timor, while the other drawings are side views (or ‘elevations’) of mountains on the region’s islands to use as landmarks when navigating.

The many navigation aids marked on this map, including bathymetry (sea depth), anchor points, shoals, and elevations of hills, were designed to guide ships around this part of the west coast of Timor. The Dutch fort Concordia is also marked.

Hand-drawn map of islands in the Riau Archipelago, with bathymetry (sea depth) marked. It features side views of hills (‘elevations’) to use as landmarks, including ‘Jehore hill’, probably in Johor at the southern tip of the Malay Peninsula.

Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Map of the northern Malacca Strait—between Sumatra and Malaya—with shoals and reefs marked, some labelled as ‘dangerous’. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Map of the northern Malacca Strait—between Sumatra and Malaya—with shoals and reefs marked, some labelled as ‘dangerous’. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.